snowflake id가 이상하게 생성되는 문제 해결결

impl/Utils/GenerateID.cpp

@@ -3,25 +3,28 @@
 namespace Chattr {
 
 Snowflake GenerateID() {
-    static struct _EPOCH {
-        _EPOCH() {
+    static struct EpochInitializer {
+        EpochInitializer() {
             EPOCH = std::chrono::system_clock::now();
         }
         std::chrono::system_clock::time_point EPOCH;
-    } __EPOCH__;
+    } epochInitializer;
     
     static std::mutex snowflakeGenerateMutex_;
 
     std::lock_guard<std::mutex> lock(snowflakeGenerateMutex_);
-#ifdef _WIN32
-    DWORD tid = GetCurrentThreadId();
-#elif __linux__
-    pthread_t tid = pthread_self();
-#endif
-    static int sequence = 0;
+
+    std::size_t tid;
+    #ifdef _WIN32
+        tid = static_cast<std::size_t>(GetCurrentThreadId());
+    #elif __linux__
+        tid = static_cast<std::size_t>(pthread_self());
+    #endif
+
+    thread_local static int sequence = 0;
     Snowflake id = {};
 
-    auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now() - __EPOCH__.EPOCH);
+    auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now() - epochInitializer.EPOCH);
     id.timestamp = timestamp.count();
     id.instance = tid;
     id.sequence = sequence++;